EVIDENCE OF ZIRCON U-Pb AGES FOR THE FORMATION TIME OF THE EAST KUNLUN LEFT-LATERAL DUCTILE SHEAR BELT
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摘要: 巴颜咯拉—松潘甘孜地体与东昆仑南地体晚三叠纪斜向碰撞形成大规模的东昆仑左行走滑韧性剪切带，新生代时期韧性剪切转为脆性左旋走滑并构成青藏高原向东逃逸的北部边界。为了确定早期韧性剪切变形时代，对剪切带上2个同构造花岗斑岩脉进行了激光探针(LA-MC-ICP MS)测年研究，获得了196.4 ± 2.3 Ma和195.1 ± 1.6 Ma的锆石206Pb/238U加权平均年龄，表明东昆仑左行走滑韧性剪切带形成于燕山早期。Abstract: The large-scale East Kunlun left-lateral ductile shear belt was formed by an oblique collision between the Bayan Har-Songpan-Ganzi terrain and the southern East Kunlun terrain during the Late Triassic. During the Cenozoic, this ductile shear belt was transformed into a brittle leftlateral strike-slip belt, and became the north boundary for the eastward "escape" of the QinghaiTibet Plateau. The La-MC-ICPMS dating for two syntectonic granite-porphyry veins in the large ductile shear belt yielded two weighted zircon 206Pb/238U ages of 196.4 ± 2.3 Ma and 195.1 ± 1.6 Ma. These ages suggest that the East Kunlun left-lateral ductile shear belt should form during the early Yanshanian Movement.
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Key words:
- ductile shear belt /
- zircon U-Pb age /
- Early Yanshan Movement /
- East Kunlun orogenic
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表 1 纳赤台地区同构造花岗斑岩锆石U-Pb同位素分析表
Table 1. U-Pb data of zircons from syn-tectonic porphyry in Naij Tal area
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[1] 许志琴, 杨经绥, 刘海兵, 等.造山的高原——青藏高原地提拼合、碰撞造山及隆升机制[M].北京:地质出版社, 2007. 350~460.XU Zhi~qin, YANG Jing-sui, LIU Hai-bing, et al. An orogenic plateau: Terrain tectonics, collisional orogenesis and rising mechanisms of the Qinghai-Tibet Plateau[M]. Beijing: Geological Publishing Hose, 2007. 350~460. [2] 许荣华.西藏中部花岗岩类同位素地质研究进展[J].矿物岩石化学通报, 1985, (2) : 71~72. http://kns.cnki.net/KCMS/detail/detail.aspx?filename=kydh198502005&dbname=CJFD&dbcode=CJFQXU Rong-hua. The study of zircons from granitic rocks in the middle Tibet[J]. Bulletin of Mineralogy, Petrology and Geochemistry, 1985, (2) : 71~72. http://kns.cnki.net/KCMS/detail/detail.aspx?filename=kydh198502005&dbname=CJFD&dbcode=CJFQ [3] 刘成东, 周肃, 莫宣学, 等.东昆仑造山带后碰撞花岗岩岩石地球化学和40Ar/39Ar同位素年代学约束[J].华东地质学院学报, 2003, 26(4) : 301~305. http://kns.cnki.net/KCMS/detail/detail.aspx?filename=hddz200304000&dbname=CJFD&dbcode=CJFQLIU Cheng-dong, Zhou Su, MO Xuan-xue, et al. Constraint on 40Ar/39Ar isotopic dating and geochemistry of the collisional granitic rocks in the orogenic belt of East Kunlun[J]. Journal of East China Geological Institute, 2003, 26(4) : 301~305. http://kns.cnki.net/KCMS/detail/detail.aspx?filename=hddz200304000&dbname=CJFD&dbcode=CJFQ [4] 倪晋宇, 胡道功, 周春景.东昆仑造山带纳赤台群形成的大地构造环境探讨[J].地质力学学报, 2010, 16(1) : 11~20. http://journal.geomech.ac.cn/ch/reader/view_abstract.aspx?flag=1&file_no=20100102&journal_id=dzlxxbNI Jin-yu, HU Dao-gong, ZHOU Chun-jing. Discussion on tectonic environment of Naij Tal Group, East Kunlun orogenic belt[J]. Journal of Geomechanics, 2010, 16(1) : 11~20. http://journal.geomech.ac.cn/ch/reader/view_abstract.aspx?flag=1&file_no=20100102&journal_id=dzlxxb [5] 周春景, 胡道功, Barosh P J, 等.东昆仑三道湾流纹英安斑岩锆石U-Pb年龄及其地质意义[J].地质力学学报, 2010, 16(1) : 28~35. http://journal.geomech.ac.cn/ch/reader/view_abstract.aspx?flag=1&file_no=20100104&journal_id=dzlxxbZHOU Chun-jing, HU Dao-gong, Barosh P J, et al. Zircon U-Pb dating of the rhyolite-dcite porphyry in the Sandaowan of east Kunlun MTS and its geological significance[J]. Journal of Geomechanics, 2010, 16(1) : 28~35. http://journal.geomech.ac.cn/ch/reader/view_abstract.aspx?flag=1&file_no=20100104&journal_id=dzlxxb [6] 陆露, 胡道功, 张永清, 等.昆中断裂带同构造花岗斑岩锆石U-Pb年龄及其构造意义[J].地质力学学报, 2010, 16(1) : 36~43. http://journal.geomech.ac.cn/ch/reader/view_abstract.aspx?flag=1&file_no=20100105&journal_id=dzlxxbLU Lu, HU Dao-gong, ZHANG Yong-qing, et al. Ziron U-Pb age for syntectoin granitic porphyry and its teceonic significance in the middle Kunlun fallt belt[J]. Journal of Geomechanics, 2010, 16(1) : 36~43. http://journal.geomech.ac.cn/ch/reader/view_abstract.aspx?flag=1&file_no=20100105&journal_id=dzlxxb [7] 吴芳, 张绪教, 张永清, 等.东昆仑闹仓坚沟组流纹质凝灰岩锆石U-Pb年龄及其地质意义[J].地质力学学报, 2010, 16(1) : 44~50. http://journal.geomech.ac.cn/ch/reader/view_abstract.aspx?flag=1&file_no=20100106&journal_id=dzlxxbWU Fang, ZHANG Xu-jiao, ZHANG Yong-qing, et al. Zircon U-Pb ages for rhyolite tuff of the Naocangjiangou Formation in the east Kulun orogenic belt and their implication[J]. Journal of Geomechanics, 2010, 16(1) : 44~50. http://journal.geomech.ac.cn/ch/reader/view_abstract.aspx?flag=1&file_no=20100106&journal_id=dzlxxb [8] 张耀玲, 张绪教, 胡道功, 等.东昆仑造山带纳赤台群流纹岩SHRIMP锆石U-Pb年龄[J].地质力学学报, 2010, 16(1) : 21~27, 50. http://journal.geomech.ac.cn/ch/reader/view_abstract.aspx?flag=1&file_no=20100103&journal_id=dzlxxbZHANG Yao-ling, ZHANG Xu-jiao, HU Dao-gong, et al. SHRIMP-based zircon U-Pb ages for rhyolite of the Naij Tal Group in the east Kulun orogenic belt[J]. Journal of Geomechanics, 2010, 16(1) : 21~27, 50. http://journal.geomech.ac.cn/ch/reader/view_abstract.aspx?flag=1&file_no=20100103&journal_id=dzlxxb [9] 薛腊梅, 赵希涛, 张耀玲, 等.遥感技术在东昆仑新生代地质填图中的应用[J].地质力学学报, 2010, 16(1) : 70~77. http://journal.geomech.ac.cn/ch/reader/view_abstract.aspx?flag=1&file_no=20100109&journal_id=dzlxxbXUE La-mei, ZHAO Xi-tao, ZHANG Yao-ling, et al. Application of remote sensing technique in the east Kunlun Cenozoic geological mapping[J]. Journal of Geomechanics, 2010, 16(1) : 70~77. http://journal.geomech.ac.cn/ch/reader/view_abstract.aspx?flag=1&file_no=20100109&journal_id=dzlxxb [10] 高万里, 张绪教, 王志刚, 等.基于ASTER遥感图像的东昆仑造山带岩性信息提取研究[J].地质力学学报, 2010, 16(1) : 59~69. http://journal.geomech.ac.cn/ch/reader/view_abstract.aspx?flag=1&file_no=20100108&journal_id=dzlxxbGAO Wan-li, ZHANG Xu-jiao, WANG Zhi-gang, et al. ASTER remote sensing image-based lithologic information extraction of the east Kulun orogenic belt[J]. Journal of Geomechanics, 2010, 16(1) : 59-69. http://journal.geomech.ac.cn/ch/reader/view_abstract.aspx?flag=1&file_no=20100108&journal_id=dzlxxb [11] 李怀坤, 耿建珍, 郝爽, 等.用激光烧蚀多接收器等离子体质谱仪(LA-MC-ICP MS)测定锆石U-Pb同位素年龄的研究[J].矿物岩石地球化学通报, 2009, 28(增刊) : 77. http://kns.cnki.net/KCMS/detail/detail.aspx?filename=kwxb2009s1311&dbname=CJFD&dbcode=CJFQLI Huai-kun, GENG Jian-zhen, HAO Shuang, et al. Research on the dating zircon U-Pb age by LA-MC-ICP MS[J]. Bulletin of Mineralogy, Petrology and Geochemistry, 2009, 28(Supp.) : 77. http://kns.cnki.net/KCMS/detail/detail.aspx?filename=kwxb2009s1311&dbname=CJFD&dbcode=CJFQ [12] 周剑雄, 陈振宇.电子探针下锆石阴极发光的研究[M].成都:电子科技大学出版社, 2007. 40~50.ZHOU Jian-xiong, CHEN Zhen-yu. The study of the cathode luminescence of zircon under the electron probe[M]. Chengdu: University of Electronic Science and Technology Publishing House, 2007. 40~50. [13] 吴元保, 郑永飞.锆石成因矿物学研究及对U-Pb年龄解释的制约[J].科学通报, 2004, 49(16) : 12~35. http://kns.cnki.net/KCMS/detail/detail.aspx?filename=kxtb200416001&dbname=CJFD&dbcode=CJFQWU Yuan-bao, Zheng Yong-fei. The mineralogical study for the causes of zircon formation and the constraints for the explanation of the U-Pb isotope age[J]. Chinese Science Bulletin, 2004, 49(16) : 12~35. http://kns.cnki.net/KCMS/detail/detail.aspx?filename=kxtb200416001&dbname=CJFD&dbcode=CJFQ [14] 袁万明, 莫宣学, 喻学惠, 等.东昆仑印支期区域构造背景的花岗岩记录[J].地质评论, 2000, 46(6) : 203~210. http://kns.cnki.net/KCMS/detail/detail.aspx?filename=dzlp200002012&dbname=CJFD&dbcode=CJFQYUAN Wan-ming, MO Xuan-xue, YU Xue-hui, et al. The record in granitic rocks under the regional tectonic background of the Indosinian stage, East Kunlun[J]. Geological Review, 2000, 46(6) : 203~210. http://kns.cnki.net/KCMS/detail/detail.aspx?filename=dzlp200002012&dbname=CJFD&dbcode=CJFQ -
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